Kaichou wa maid-sama's USUI and MISAKIOne piece's LUFFY and NAMI although they cannot be called as official "couples" and some says that there aren't big possibility of this to happen since OP creator Oda said himself that he'll not include romance *for now? * still I support this pairings!

there are lot more but some of the manga and couples that I supported were already aired as anime (Just like the two that I write above) so I guess it's not applicable to list it down to this thread ne?

Yeah.. but you don't read manga that much,ne? hahaha.. Try Barajou but it is still not finished but Moe Kare and Love Celeb is already finished that I've read it for .... I lost count of how many times I've read it.. LOL